Extensible window-screen



Patented Sept. 21, 1897.

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UNITED STATES PATENT EEICE.

ALvIN M. BENTLEY, or owosso, MICHIGAN,

ExTENslBLE wINoow-SCREEN.

SPECIFICATION forming part of Letters Patent No.'590,44v8, dated September 21, 1897. Application filed February 8, 1897. Serial No. 622,398. (No model.)

' @nnen of the United states, residing at Owosso, in the county of Shiawassee and State of Michigan, have invented certain new and useful Improvements in Extensible Window- Screens, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention consists in the construction of an extensible window-screen, and particularly in the construction of a metallic 'connecting-bar between the ends of the wooden rails of the three sided window-frames, whereby'a rigid but light connection is made, which permits at the same time of securing wire-cloth thereto and of retaining it at all points close to the surface of the rails, and, further, in the construction of the sliding connection between the frames, all as more fully hereinafter described.

In the drawings, Figure l is a perspective view of a portion of my improved extensible screen, showing the sliding rails and their connection. Fig. 2 is a horizontal section therethrough. Fig. 3 is a sectional perspective view illustrating the action of the me tallic connecting-bar'and its connection to the rail. Fig. et is a sectional perspective view showing the construction of the sliding joint between the rails. Fig. 5 is a cross-section through a pair of sliding rails, illustrating the same connection. Fig. G is a crosssection through the blank from which the metallic connecting-bar is formed.

Each frame is made of two three-sided wooden frames, each frame comprising the end bar A and the top and bottom rails B. These rails are of the cross-section shown in Figs. 3 and 4, having a groove C in their inner faces, one side thereof being under cut, as shown at D, or forming whatl call a half or the single dovetail.77

E is a gain formed on the edge of the rail, which leaves a bead F between the groove C and the gain. ,To form the connection between each pair of these rails, I take a block G of wood and cut out from one side a V- shaped groove, as shown atH in Fig. 5. This leaves two inclined tongues projecting from either side of the middle portion thereof, the thickness of these tongues being equal substantially to the depth of the grooves in the rails, these blocks being engaged with the grooves in the two rails, half in each groove, and being secured to the ends of the rails, as plainly shown in Fig. et, forming the sliding connection between the two parts of the screen and also acting as stops to prevent the withdrawal endwise of the rails.

I is a wire-cloth. This is connected to the ends by the strips J and is connected tothe side rails by being tacked in the gain E thereof, and the opposite end is secured to and by a metallic connecting-bar K, which is formed in the following manner: A piece of metal is doubled to form a blank, as shown at L in Fig. 6. The edge of the wire-cloth is inserted between the two sides of this strip and then the strip is bent to form an anglebar, as shown in dotted lines in that iigure.

securing means to hold the wire-cloth to the bar. Each of the wooden side rails is provided with a slot or groove O on its inner edge, in which one member or arm a of the anglebar is forced, this being done, of course, as the form is being made. The other arm b, having the open lips, through which the edge of the wire-cloth projects, is laid iiush and flat against the side of the rail in the gain E, holding theV edges of the cloth-wire in that gain, so that there is little or no friction bethe frames one upon the other. This construction Iuakes an exceptionally good, light, strong, and satisfactory screen with a minimum of labor and expense.

What I claim as my invention isl. In an extensible window-screen, two three-sided wooden frames slidingly secured together by means of interlocking devices on the parallel bars of the frame, having secur ing-slots in their inner faces for the crossbars, a connection between the end of the bars of each of said frames consisting of a metallic bar formed by bending a doubled sheetJnet-al blank into an angle-bar, the wire screen secured within said bar, and said bar secured in the frames by engaging one member of the angle in slots in the inner faces of the frame-bars, the other member lying along the inside face thereof.

2. In an eXtensible window-screen, having This bend in the bar serves without other tween the wire and the side rails in moving A IOO two three-sided wooden frames slidingly secured together, of connecting-bars to form the fourth side of such frames, made of doubled sheet metal bent into angle shape, the wire-cloth having its edge bent within said bar, the rails of the frames having gains on their inner edges, and securing-slots at an angle thereto, the ends of the angle-bars having one member engaging in the slots, and the other member lying in the gains of the rails for the purpose described.

3. In an extensible Window-screen having two three-sided wooden frames slidingly secured together by means of interlocking devices on the parallel bars, of said parallel bars having securing-slots in their inner faces for the inner cross-bars, having a longitudinal groove undercut on one side only, a marginal gain E and an intermediate bead F between, of blocks having a V-shaped groove cut in one face only, fitting in the groove in 

